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US6998756B2 - Rotor shaft - Google Patents

Rotor shaft Download PDF

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Publication number
US6998756B2
US6998756B2 US10/946,325 US94632504A US6998756B2 US 6998756 B2 US6998756 B2 US 6998756B2 US 94632504 A US94632504 A US 94632504A US 6998756 B2 US6998756 B2 US 6998756B2
Authority
US
United States
Prior art keywords
rotor shaft
component parts
rod member
annular
annular axial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US10/946,325
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English (en)
Other versions
US20050096141A1 (en
Inventor
Ichiro Ishii
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Assigned to HONDA MOTOR CO., LTD. reassignment HONDA MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHII, ICHIRO
Publication of US20050096141A1 publication Critical patent/US20050096141A1/en
Application granted granted Critical
Publication of US6998756B2 publication Critical patent/US6998756B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/026—Shaft to shaft connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • F05D2230/64—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/23—Gas turbine engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/55—Member ends joined by inserted section
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/57—Distinct end coupler
    • Y10T403/5706—Diverse serial connections

Definitions

  • the present invention relates to a rotor shaft. More specifically, the present invention relates to a rotor shaft, such as a main shaft of an electric generator driven by a gas turbine engine, comprising a plurality of separately made component parts which are joined together on an axis of a rod member passing through the plurality of component parts.
  • a main shaft of an electric generator driven by a gas turbine engine generally comprises a plurality of individually formed component parts such as a compressor wheel, a turbine wheel, a support structure for permanent magnets, a plurality of journals, thrust plates, etc., and these component parts are joined together on a common axis.
  • the joint of the component parts is typically achieved by passing a single rod member through the component parts to be joined together, and then applying an axial load upon abutting surfaces of the component parts on the rod member by tightening a bolt nut at an end of the rod member (see U.S. Pat. No. 5,964,663, FIG. 7, for example).
  • the produced rotor shafts may have different natural frequencies one from another and/or an excessive oscillation can take place at a resonance point, making it difficult to suppress oscillation during operation.
  • a restraining force acting upon the rotor shaft tends to be relatively small, and thus, if the axial load acting upon the abutting surfaces of the mating component parts is insufficient, an oscillation can become excessively large when a primary bending resonance frequency is reached as the rotation of the rotor shaft is accelerated. This makes it difficult for the rotor to pass through the resonance frequency safely.
  • a primary object of the present invention is to provide a rotor shaft comprising a plurality of separately formed component parts, which can ensure sufficiently large fitting strength between mating component parts during operation of the rotor shaft and at the same time can allow a sufficiently large axial load to act upon the abutting surfaces of the adjoining component parts.
  • a rotor shaft comprising: a rod member ( 26 ); and a plurality of separately formed component parts (which may comprise a compressor wheel 10 , turbine wheel 11 and a rotor 14 of an electric generator when the rotor shaft is used in a gas turbine electric generator) through which the rod member extends so that the plurality of component parts are joined together on an axis of the rod member, wherein mutually facing axial end surfaces of adjoining ones of the plurality of component parts are formed with annular projections ( 22 , 23 ) having a substantially same radial dimension (or thickness) such that an outer circumferential surface of the annular projection of one component part can tightly contact an inner circumferential surface of the annular projection of an adjoining component part.
  • the annular projections are provided in an outer peripheral portion of the mutually facing surfaces of the adjoining ones of the plurality of component parts and/or if the radial dimension of the annular projections is substantially smaller than an outer diameter of said rotor shaft.
  • the radial dimension of the annular projections may be set at between 1/10 and 1/15 of the outer diameter of the rotor shaft.
  • the annular projections which are fitted to each other have a substantially equal thickness, they will undergo a substantially same amount of radial expansion due to the thermal expansion and/or centrifugal expansion during operation, whereby advantageously maintaining a tight contact therebetween.
  • the provision of the annular projections in an outer peripheral portion of the end surfaces of the rotor shaft component parts can result in a larger diameter of the annular projections. This also contributes to equalizing the amount of expansions of the inner and outer annular projections due to centrifugal expansion during rotation of the rotor shaft, to thereby maintain the tight contact between the annular projections.
  • annular projections having a substantially small thickness (or radial dimension) can lower the rigidity thereof and thus reduce the press-fit load, whereby increasing the axial load acting upon the abutting surfaces of the fitting portions of the rotor shaft component parts. This can effectively lead to a reduced fluctuation or displacement of the rotation center of the rotor shaft.
  • an outer one of the mutually fitted annular projections of adjoining component parts has a slightly larger axial dimension (or length) than an inner one of the mutually fitted annular projections.
  • FIG. 1 is a cross-sectional view showing a structure of a gas turbine generator to which the present invention is applied;
  • FIG. 2 is an axial cross-sectional view showing a rotor shaft according to the present invention.
  • FIG. 3 is a perspective view showing the fitting portions of mating component parts of the rotor shaft according to the present invention.
  • FIG. 1 is a cross-sectional view showing a structure of a gas turbine generator to which the present invention is applied.
  • This gas turbine engine 1 comprises an engine portion 2 for generating a driving force, and an electric generator portion 3 rotationally driven by the engine portion 2 .
  • the engine portion 2 has an outer housing 4 of which end away from the generator portion 3 is substantially closed, and an inner housing 6 concentrically received in the outer housing 4 to define a combustion chamber 5 . Between the outer housing 4 and the inner housing 6 are provided an air intake passage 7 , a combustion gas passage 8 , and a heat exchanger 9 .
  • the engine portion 2 further comprises a compressor wheel 10 for taking in and compressing outer air, and a turbine wheel 11 rotationally driven by the flow of combustion gas, where the compressor wheel 10 and the turbine wheel 11 are provided concentrically with each other.
  • diffusers, stator vanes, etc. are provided at outlets of the compressor wheel 10 and turbine wheel 11 .
  • the generator portion 3 comprises a substantially cylindrical housing 12 and a stator coil 13 received in the housing 12 so as to be concentric with the compressor wheel 10 and the turbine wheel 11 .
  • a rotor shaft 14 is passed through an air core of the stator coil 13 where the rotor shaft 14 is concentric and integral with the compressor wheel 10 and the turbine wheel 11 .
  • the rotor shaft 14 mainly consists of three portions, i.e., a permanent magnet mount portion 15 located at a position corresponding to the air core of the stator coil 13 , and two journal portions 16 , 17 axially flanking the permanent magnet mount portion 15 .
  • the journal portion 17 closer to the compressor wheel 10 is integrally provided with a thrust plate 18 .
  • the two journal portions 16 , 17 and the thrust plate 18 are rotatably supported by air-lift type radial bearings 19 and thrust bearing 20 which are integrally provided to the housing 12 .
  • FIG. 2 is an axial cross-sectional view of the rotor shaft 14 which is integral with the compressor wheel 10 and the turbine wheel 11 .
  • the rotor shaft 14 comprises the axial end journal portion 16 , permanent magnet mount portion 15 , axially middle journal portion 17 and thrust plate 18 .
  • These component parts are separately made from a respective material best suit to each component part by an appropriate process.
  • Each of the component parts inclusive of the compressor wheel 10 and the turbine wheel 11 are formed with a fitting portion 21 at their axial end(s) so that they can be joined together on a single rod member 26 passing the center of the component parts by engaging the fitting portion 21 of one component part to the fitting portion 21 of the adjoining component part.
  • one of the mutually engaged fitting portions 21 has a short annular projection 22 formed along an outer periphery of a component part while the other of the mutually engaged fitting portions 21 has a short annular projection 23 having an outer diameter substantially equal to an inner diameter of the annular projection 22 .
  • the annular projections 22 , 23 each have a substantially rectangular cross-section and have a substantially same radial dimension (or thickness) D. Further, their dimensional tolerance is set such that the annular projections 22 , 23 are engaged to each other with an interference fit where an axial dimension A 2 of the outer annular projection 22 is slightly larger than an axial dimension A 1 of the inner annular projection 23 (A 1 ⁇ A 2 ).
  • the component parts of the rotor shaft are joined together on the common axis where according to the present invention, the axial dimensions A 1 , A 2 of the fitting portions 21 including the annular projections 22 , 23 are relatively small such that a loss in the axial load that would result due to a frictional resistance of the fitting portions 21 can be reduced, and thus the axial load applied to the abutting surfaces of the component parts of the rotor shaft can be increased and a press-fit loads of the component parts can be equalized.
  • the annular projections 22 , 23 constituting the fitting portions 21 are provided at an outer periphery of each component part, and their axial dimension (or thickness) D is small and substantially the same, whereby a change in the amount of interference in the fitting portions due to a difference in the thermal expansion and in the centrifugal expansion between the component parts can be minimized. Therefore, the mutual engagement force provided by the fitting portions can be kept from reducing during operation, preventing displacement of the rotation center and reducing an amount of oscillation at the resonance frequency to whereby allow the rotor shaft to safely pass the resonance point as it is accelerated.
  • the radial dimension D of the annular projections 22 , 23 needs to be set so as to avoid an excessive press-fit load and at the same time ensure a sufficient interference during operation.
  • the dimension D is set at 4 mm for the rotor shaft 14 having an outer diameter of 48 mm. In order to achieve appropriate press-fit load and interference at the same time, it is preferred that the dimension D should be set at about 1/10 to 1/15 of the diameter of the rotor shaft.
  • the fitting portions 21 tend to undergo less plastic deformation than the conventional structure, and therefore, when the rotor shaft is disassembled and assembled repeatedly, substantially the same joint strength can be achieved every time the rotor shaft is assembled. This allows a larger number of repeated disassemble and assemble of the rotor shaft for overhaul, thus contributing to increasing the total durability of the rotor shaft.
  • the rotor shaft according to the present invention can advantageously achieve higher joint strength between the component parts thereof, and can be utilized not only in a turbine engine with an electric generator as illustrated in the above embodiment but also in other rotating machinery such as a supercharger having a compressor wheel and a turbine wheel provided on a common axis.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Power Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Supercharger (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US10/946,325 2003-10-02 2004-09-22 Rotor shaft Expired - Fee Related US6998756B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2003-343975 2003-10-02
JP2003343975A JP4112468B2 (ja) 2003-10-02 2003-10-02 回転軸
JPPAT.2003-343975 2003-10-02

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US20050096141A1 US20050096141A1 (en) 2005-05-05
US6998756B2 true US6998756B2 (en) 2006-02-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/946,325 Expired - Fee Related US6998756B2 (en) 2003-10-02 2004-09-22 Rotor shaft

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JP (1) JP4112468B2 (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060255894A1 (en) * 2005-05-10 2006-11-16 Yuji Enomoto Motor
US20160003140A1 (en) * 2013-02-22 2016-01-07 Ecomotors, Inc. Electric rotor fit onto a turbomachine shaft
US20180062467A1 (en) * 2015-04-01 2018-03-01 Liebherr-Aerospace Toulouse Sas Rotor assembly and turbine engine with gas bearings including such a rotor assembly
US20220320969A1 (en) * 2021-03-31 2022-10-06 Honda Motor Co., Ltd. Combined power system
US20220325632A1 (en) * 2021-03-31 2022-10-13 Honda Motor Co., Ltd. Combined power system
US20230041460A1 (en) * 2020-01-13 2023-02-09 Bladon Jets Holdings Limited Monolithic rotor and compressor wheel

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009118471A1 (fr) * 2008-02-29 2009-10-01 Melchior Jean-Frederic Moteur a combustion interne a suralimentation pulsee
CN101823200A (zh) * 2010-05-18 2010-09-08 上海秋乐实业有限公司 一种发电机轴的制造方法
CN102434217A (zh) * 2011-11-01 2012-05-02 哈尔滨东安发动机（集团）有限公司 一体式悬臂转子结构
CN104246167B (zh) * 2012-05-03 2018-02-06 博格华纳公司 减小应力的超级背板叶轮
US9083212B2 (en) * 2012-09-11 2015-07-14 Concepts Eti, Inc. Overhung turbine and generator system with turbine cartridge
CN106678058A (zh) * 2017-02-22 2017-05-17 上海优耐特斯压缩机有限公司 高速电机直驱透平机械的超高速转子结构
DE102018221138A1 (de) * 2018-12-06 2020-06-10 Robert Bosch Gmbh Rotor für eine elektrische Antriebsmaschine zum Antrieb eines Verdichters, einer Turbine oder einer Laderwelle eines Abgasturboladers und Abgasturbolader mit einer elektrischen Antriebsmaschine und einem solchen Rotor
CN112360577B (zh) * 2020-10-26 2023-05-12 北京动力机械研究所 一种复合式叶轮发电系统转子结构与工艺
CN112360570B (zh) * 2020-10-26 2022-08-16 北京动力机械研究所 一种径流叶轮侧置式高速热电转换系统转轴及其工艺
CN112360574B (zh) * 2020-10-26 2023-03-24 北京动力机械研究所 一种高速低应力涡轮发电系统旋转组件结构
CN112360573B (zh) * 2020-10-26 2023-06-13 北京动力机械研究所 一种紧凑型径流涡轮热电转换系统旋转组件
CN112360576B (zh) * 2020-10-26 2022-08-09 北京动力机械研究所 一种一体化叶轮侧置热电转换系统转轴结构
US12040663B2 (en) 2021-03-31 2024-07-16 Honda Motor Co., Ltd. Combined power system
JP7627597B2 (ja) 2021-03-31 2025-02-06 本田技研工業株式会社 複合動力システム
JP7612489B2 (ja) 2021-03-31 2025-01-14 本田技研工業株式会社 複合動力システム
JP2023106933A (ja) 2022-01-21 2023-08-02 本田技研工業株式会社 回転電機システムと、それを備える複合動力システム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3282614A (en) * 1963-10-10 1966-11-01 Patterson Ind Inc Coupling device
US4935656A (en) * 1985-08-29 1990-06-19 Isuzu Motors Limited High speed motor/generator for turbocharger
US5964663A (en) 1997-09-19 1999-10-12 Capstone Turbine Corp. Double diaphragm compound shaft

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3282614A (en) * 1963-10-10 1966-11-01 Patterson Ind Inc Coupling device
US4935656A (en) * 1985-08-29 1990-06-19 Isuzu Motors Limited High speed motor/generator for turbocharger
US5964663A (en) 1997-09-19 1999-10-12 Capstone Turbine Corp. Double diaphragm compound shaft

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060255894A1 (en) * 2005-05-10 2006-11-16 Yuji Enomoto Motor
US7906881B2 (en) * 2005-05-10 2011-03-15 Hitachi, Ltd. Motor
US20160003140A1 (en) * 2013-02-22 2016-01-07 Ecomotors, Inc. Electric rotor fit onto a turbomachine shaft
US10309300B2 (en) * 2013-02-22 2019-06-04 Borgwarner Inc. Electric rotor fit onto a turbomachine shaft
US20180062467A1 (en) * 2015-04-01 2018-03-01 Liebherr-Aerospace Toulouse Sas Rotor assembly and turbine engine with gas bearings including such a rotor assembly
US10578117B2 (en) * 2015-04-01 2020-03-03 Liebherr-Aerospace Toulouse Sas Rotor assembly and turbine engine with gas bearings including such a rotor assembly
US20230041460A1 (en) * 2020-01-13 2023-02-09 Bladon Jets Holdings Limited Monolithic rotor and compressor wheel
US11994143B2 (en) * 2020-01-13 2024-05-28 Bladon Jets Holdings Limited Monolithic rotor and compressor wheel
US20220320969A1 (en) * 2021-03-31 2022-10-06 Honda Motor Co., Ltd. Combined power system
US20220325632A1 (en) * 2021-03-31 2022-10-13 Honda Motor Co., Ltd. Combined power system
US11732605B2 (en) * 2021-03-31 2023-08-22 Honda Motor Co., Ltd. Combined power system
US11984769B2 (en) * 2021-03-31 2024-05-14 Honda Motor Co., Ltd. Combined power system

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Publication number Publication date
JP4112468B2 (ja) 2008-07-02
JP2005106029A (ja) 2005-04-21
US20050096141A1 (en) 2005-05-05

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